AttributeError: 'NoneType' object has no attribute '_proxied' while running pylint==2.3.0

[plocharz-9livesdata]

fail_pylint.py:

import logging

logger = logging.getLogger(__name__)

try:
    pass
except Exception as e:
    logger.debug("error: {e.__class__}".format(e=e))

Steps to reproduce

1. run pylint on file fail_pylint.py

Current behavior

Following traceback is printed:

Traceback (most recent call last):
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/astroid/bases.py", line 183, in getattr
    values = self._proxied.instance_attr(name, context)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/astroid/scoped_nodes.py", line 2311, in instance_attr
    target=self, attribute=name, context=context
astroid.exceptions.AttributeInferenceError: '__class__' not found on <ClassDef.Exception l.0 at 0x7fc0bfd85208>.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/local/starfish/venv-starfish-3.6.7/bin/pylint", line 11, in <module>
    sys.exit(run_pylint())
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/__init__.py", line 20, in run_pylint
    Run(sys.argv[1:])
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/lint.py", line 1629, in __init__
    linter.check(args)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/lint.py", line 943, in check
    self._do_check(files_or_modules)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/lint.py", line 1076, in _do_check
    self.check_astroid_module(ast_node, walker, rawcheckers, tokencheckers)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/lint.py", line 1159, in check_astroid_module
    walker.walk(ast_node)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/utils.py", line 1303, in walk
    self.walk(child)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/utils.py", line 1303, in walk
    self.walk(child)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/utils.py", line 1303, in walk
    self.walk(child)
  [Previous line repeated 2 more times]
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/utils.py", line 1300, in walk
    cb(astroid)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/checkers/strings.py", line 357, in visit_call
    self._check_new_format(node, func)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/checkers/strings.py", line 451, in _check_new_format
    self._check_new_format_specifiers(node, fields, named_arguments)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/pylint/checkers/strings.py", line 497, in _check_new_format_specifiers
    previous = previous.getattr(specifier)[0]
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/astroid/bases.py", line 186, in getattr
    return [self.special_attributes.lookup(name)]
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/astroid/interpreter/objectmodel.py", line 115, in lookup
    return getattr(self, IMPL_PREFIX + name)
  File "/local/starfish/venv-starfish-3.6.7/lib/python3.6/site-packages/astroid/interpreter/objectmodel.py", line 586, in attr___class__
    return self._instance._proxied
AttributeError: 'NoneType' object has no attribute '_proxied'

Expected behavior

------------------------------------
Your code has been rated at 10.00/10

pylint --version output

pylint 2.3.0
astroid 2.2.0
Python 3.6.7 (v3.6.7:6ec5cf2, Oct 22 2018, 11:29:07) 
[GCC 4.8.4]

[PCManticore]

Thanks for reporting this @plocharz-9livesdata This is fixed in astroid's master and it's going to be part of astroid 2.2.1 in a bit. Doing a pass through the regressions and planning to release a bug fix release soon.